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IS ISOLATED SYSTOLIC HYPERTENSION A WHITE COAT’ PHENOMENON IN THE ELDERLY? (1992)

Silagy, C. A. ; McNeil, J. J. ; McGrath, B. P. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Clinical and experimental pharmacology and physiology 19 (1992), S. 0

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ISSN: 1440-1681

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: 1. Repeated clinic blood pressure measurement was compared with non-invasive ambulatory blood pressure (ABP) monitoring in 10 elderly subjects with isolated systolic hypertension (ISH) and 11 normotensive controls (NT).2. Subjects were assessed on four occasions at weekly intervals. None was receiving antihypertensive or vasoactive medication.3. Mean clinic blood pressure was consistently higher than mean daytime ABP in both clinical groups. This effect was greater for systolic (SBP) than diastolic blood pressure (DBP) and in the ISH group compared with the NT group. The reproducibility of the clinic minus ABP difference was high in both groups; the mean±s.d. of the differences was 26± 15/9 ± 2 mmHg in the ISH group and 7 ± 18/8 ± 9 mmHg in the controls.4. ABP readings were normally distributed for both SBP and DBP in both groups. In the ISH group, the frequency distribution of SBP readings was shifted to the right whilst the distribution of DBP readings overlapped that of the NT subjects.5. These results suggest a pressor response may largely account for the elevated SBP seen in elderly subjects with sustained ISH based on casual readings.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1440-1681.1992.tb00454.x

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An analysis of associations between social class and ambient magnetic fields in metropolitan melbourne (1992)

Salzberg, M. R. ; Farish, S. J. ; Delpizzo, Vincent

New York, NY [u.a.] : Wiley-Blackwell

Bioelectromagnetics 13 (1992), S. 163-167

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ISSN: 0197-8462

Keywords: power lines ; ELF ; Cancer ; confounders ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Physics

Notes: In the course of a study on residential magnetic-field exposure, some incidental data were obtained that bear on the issue of confounding of magnetic field exposure by social class. We have explored the possibility that the magnetic flux density of 50 Hz fields measured in Melbourne streets is correlated with a number of variables that index the socio-economic status of the neighborhood. We have examined also for a correlation between field-intensity levels and sums of some or all of the indicators, which were weighted to provide an overall score on socio-economic status. Although some of the indexes were weakly, but significantly, correlated with environmental levels of magnetic fields, the combined indices were not. These results indicate that socio-economic status is not likely to be a confounder in epidemiological studies of residential exposure to ELF magnetic fields in Melbourne. © 1992 Wiley-Liss, Inc.

Additional Material: 2 Tab.